re/src/msg/param.c
2014-02-22 07:36:01 +00:00

70 lines
1.3 KiB
C

/**
* @file param.c SIP Parameter decode
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re_types.h>
#include <re_fmt.h>
#include <re_msg.h>
/**
* Check if a parameter exists
*
* @param pl Pointer-length string
* @param name Parameter name
* @param val Returned parameter value
*
* @return 0 for success, otherwise errorcode
*/
int msg_param_exists(const struct pl *pl, const char *name, struct pl *val)
{
struct pl v1, v2;
char xpr[128];
if (!pl || !name || !val)
return EINVAL;
(void)re_snprintf(xpr, sizeof(xpr), ";[ \t\r\n]*%s[ \t\r\n;=]*", name);
if (re_regex(pl->p, pl->l, xpr, &v1, &v2))
return ENOENT;
if (!v2.l && v2.p < pl->p + pl->l)
return ENOENT;
val->p = v1.p - 1;
val->l = v2.p - val->p;
return 0;
}
/**
* Decode a Parameter
*
* @param pl Pointer-length string
* @param name Parameter name
* @param val Returned parameter value
*
* @return 0 for success, otherwise errorcode
*/
int msg_param_decode(const struct pl *pl, const char *name, struct pl *val)
{
char expr[128];
struct pl v;
if (!pl || !name || !val)
return EINVAL;
(void)re_snprintf(expr, sizeof(expr),
";[ \t\r\n]*%s[ \t\r\n]*=[ \t\r\n]*[~ \t\r\n;]+",
name);
if (re_regex(pl->p, pl->l, expr, NULL, NULL, NULL, &v))
return ENOENT;
*val = v;
return 0;
}